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fpga 与c6678 的srio 4X问题



我们设计的FPGA v6系列与C6678直接srio连接4X,经过测试发现FPGA的端口状态mode_sel不能一直保持为高,即4X模式,有时会变0,降为1X模式,数据也在传输!怎么回事?很困惑!求解